What is a primary consequence of mixing different types of metal fittings?

Mixing different types of metal fittings can lead to the corrosion of the less noble metal due to a process known as galvanic corrosion. When dissimilar metals are in contact with an electrolytic solution, such as water or steam, an electrochemical reaction can occur. In this reaction, the more noble (or less reactive) metal protects the less noble (or more reactive) metal, which is more susceptible to corrosion.

The less noble metal becomes the anode in the electrochemical process and will corrode faster than it would if it were used alone, leading to potential system failures, leaks, or hazardous conditions. This understanding is crucial for those working with steam systems and other commercial food equipment. Properly selecting compatible metals can prevent this issue and ensure the longevity and safety of the equipment.